Hi old rider, I'm going to purchase starter leads off exige but was also considering buying coil pack also, I believe you have experience doing both mods ? Any advice would be appreciated , many thanks.

I've done both but not at the same time on the same bike.
The two do different jobs. The coils give a fatter spark, which gives better throttle response and improves idling and low speed running.
The cables allow all the battery's energy to reach the starter motor and ignition system.
Both highly recommended :)